William Harrison Mellick III, PHD

Primary specialty

Clinical PsychologistTaxonomy code 103TC0700X

License

1542 Issued in SC

Practice address

171 Ashley Ave
Charleston, SC 29425-8908

Phone

(843) 792-1414

NPI assigned

Aug 23, 2022

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 5

Addresses

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in SC

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: No
• Power mobility devices: No
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Clinical Psychologist

Education

Other, 2017

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

University Medical Associates of the Medical University of South CarolGroup PAC ID 6305758574, 1,634 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Philosophy

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• University Medical Associates of the Medical University of South Carol

  • Multi-Specialty Clinic/Center
  • Charleston, SC
  • NPI 1043241110
  Medicare reassignment Care Compare group NPD
• University Medical Associates of the Medical University of South Carol

  • Family Medicine Physician
  • Charleston, SC
  • NPI 1982678496
  NPD

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1661212800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757376000000",
    "number": "1154040293",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 751461",
            "city": "CHARLOTTE",
            "state": "NC",
            "postal_code": "282751461"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "171 ASHLEY AVE",
            "city": "CHARLESTON",
            "state": "SC",
            "postal_code": "294258908",
            "telephone_number": "843-792-1414"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MELLICK",
        "first_name": "WILLIAM",
        "middle_name": "HARRISON",
        "name_prefix": "Dr.",
        "name_suffix": "III",
        "credential": "PHD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2022-08-23",
        "last_updated": "2025-09-09",
        "certification_date": "2025-09-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "103TA0400X",
            "taxonomy_group": "",
            "desc": "Psychologist, Addiction (Substance Use Disorder)",
            "state": "SC",
            "license": "1542",
            "primary": false
        },
        {
            "code": "103TF0000X",
            "taxonomy_group": "",
            "desc": "Psychologist, Family",
            "state": "SC",
            "license": "1542",
            "primary": false
        },
        {
            "code": "103TB0200X",
            "taxonomy_group": "",
            "desc": "Psychologist, Cognitive & Behavioral",
            "state": "SC",
            "license": "1542",
            "primary": false
        },
        {
            "code": "103TC2200X",
            "taxonomy_group": "",
            "desc": "Psychologist, Clinical Child & Adolescent",
            "state": "SC",
            "license": "1542",
            "primary": false
        },
        {
            "code": "103TC0700X",
            "taxonomy_group": "",
            "desc": "Psychologist, Clinical",
            "state": "SC",
            "license": "1542",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "direct@direct.musc.edu",
            "affiliation": "N",
            "use": "HIE",
            "useDescription": "Health Information Exchange (HIE)",
            "address_1": "171 Ashley Ave",
            "city": "Charleston",
            "state": "SC",
            "country_code": "US",
            "postal_code": "294258908",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Rustin Meister, M.D.
• Sarinya Meknarit, MD
• Margaret Melikian, DO
• Mary Ryan Melin, F.N.P.
• Melissa Shiver Speech Services LLC
• Juliana De Assis Mello, CRNA
• Nicholas Joseph Mello, PA-C
• Joel Thomas Melroy, PHARM.D., M.S.
• Mary Katherine Melroy, O.T.R.
• Caroline Williams Melton

• Clinical Psychologist in Charleston, SC
• Providers in Charleston, SC by specialty
• Clinical Psychologist in South Carolina

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 9, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.